I dont get it

I don't get it. I was walking with my friend to school after having a huge fight with my mother and I was venting to her about what had happend. A boy in my school was walking behind me and heard everything I said. He went back to all of his friends and told them that I'm a spoiled self centered bitch who complains to much. Meanwhile i don't know what goes on in his home and I don't care to know but he doesn't know a thing i go through so he has no right to say anthing. I know it's a dumb thing to complain over but it just bugs me a lot for no reason.